Neck fan



FIG. 1 is a first perspective view of a neck fan showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depict portions of the neck fan in which the design is embodied that form no part of the claimed design. 

CLAIM We claim the ornamental design for a neck fan, as shown and described. 